IF ITS A SINGLE JAG YOU COULD HOUSE HIM IN A 75 TILL HE GETS BIGGER...I BREED MY PAIR IN A 75 BUT THEY LIVE IN AA 225. THEY LIVE WITH A OSCAR PAIR, GREEN TERROR PAIR, CUTTERI, JD PAIR, GRAMMODE PAIR, LOSELLI PAIR AND A RED TIGER MOTAGUENSE. JUST MAKE SURE YOU HAVE LOGS,CAVES, OR WHATEVER THAT EVERYONE CAN CLAIM THEIR OWN. BLOCKING DIRECT LINES OF SIGHT WITH DRIFTWOOD OR ROCKS HELPS TOO.